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Abstract

Disclosed is a scheme for using radio frequencies (RF) in such a fashion to allow efficient packet transmission of data between a single central site (Host) and a larger number of remote stations (Clients). The RF may be transmitted via direct radio propagation or, more likely, be part of a broadband network within a building, campus, or Community Antenna Television (CATV) cable system.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
52% of the total text.

Packet Networking Scheme for Radio Frequencies

Disclosed is
a scheme for using radio frequencies (RF) in
such a fashion to allow efficient packet
transmission of data
between a single central site (Host) and a larger number of remote
stations (Clients). The RF may be
transmitted via direct radio
propagation or, more likely, be part of a broadband network within a
building, campus, or Community Antenna Television (CATV) cable
system.

One
embodiment is a system comprising a pair of standard
television channels, one transmitting in each direction; however,
this design could equally well work on much narrower channels or
across many TV channels. The figure
shows such a cable system 1
where two channels, "ChanF" 2 and "ChanR" 3 are used for
bidirectional data transmission. "ChanF" is divided into a number of
subchannels, "ChanF"_1 - "ChanF"_n, to be used from the
host to the
clients, and "ChanR" is divided into a number of subchannels
chanR_1-chanR_n, to be used from the clients to the host. Each
subchannel from the host, i.e.,
"ChanF"_1 is matched to the like
numbered subchannel from the client, i.e., chanR_1. A full-duplex
pair of subchannels is identified by its common number, i.e., 1.

At the host
site, a multiport packet switch is configured with
a fixed-frequency RF modem 5 on each port in 1-to-1 correspondence
with subchannel pairs. The switch treats
each of these ports as part
of the same parallel trunk group such that a packet arriving on any
of the sub-channels will be identified
by its internal source
address rather than by the port on which it arrives.

At each
client site a frequency agile RF modem 6 provides
access to any pair of subchannels (and therefore the associated
switch port) under control of client computer 8. When a client
system is idle, it commands its modem to tune to a prearranged
subchannel K to wait for instruction from the host site. To
facilitate communication with individual clients via the common
subchannel K, each is assigned to a unique address; the intended
client for each host-originated message on subchannel K is identified
by including the client's address.

The host
system controller maintains a table 7 of available
subchannel pairs and the status of each client.
A connection is
originated...